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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 533 | function do_trackbacks($post_id) { |
| 534 | global $wpdb; |
| 535 | |
| 536 | $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id"); |
| 537 | $to_ping = get_to_ping($post_id); |
| 538 | $pinged = get_pung($post_id); |
| 539 | if ( empty($to_ping) ) |
| 540 | return; |
| 541 | if (empty($post->post_excerpt)) |
| 542 | $excerpt = apply_filters('the_content', $post->post_content); |
| 543 | else |
| 544 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 545 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 546 | $excerpt = strip_tags($excerpt); |
| 547 | $excerpt = substr($excerpt, 0, 252) . '...'; |
| 548 | |
| 549 | $post_title = apply_filters('the_title', $post->post_title); |
| 550 | $post_title = strip_tags($post_title); |
| 551 | |